Reg Interfacing Pre-Amp stage in C5505 USB stick

Started by "govind.sk85" ●February 11, 2011

Hi All,
I am having C5505USB_Kit.
It has SJ1-3515-SMT, 5PJACK STEREO which is directly connected to TLVAIC3024 Codec.
I want to add a pre-amplification section before mic input goes to the line in of the codec.

My Dobut:
I want to add a pre-amplification section before the stereo jack itself.
I am planning to use OPA335 .My condenser mic is P9955-ND.C5505USB_Kit has SJ1-3515 streo audio jack connector.I want to use Preamp stage before SJ1-3515 connector.
Pls suggest how can i do it effectively as i have to use MIC bias from AIC3204 codec to the OPA335.
Is it suggested to do Pre-amplication with lowpass filtering.
Can i use an R-C 1 order low pass filter and give signal to OPA335.

Please Suggest.

Reply by mehdi hosseini ●February 15, 20112011-02-15

Hi
About the biasing, I have no idea. But for Pre-amplification and filtering,
I have some experiments using TS972 Op-amp with 3.3V supply. This circuit
has really good performance for a single supply pre-amplifier.

http://www.filefactory.com/file/b55h28g/n/PreAmp.pdf

Regards
--
Seyed Mehdi Hosseini

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